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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
US Government Securities, at Carrying Value $ 0 $ 0
Assets, Fair Value Adjustment 158  
US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 16 16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale 16 16
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 475 730
US Government Securities, at Carrying Value 16 16
US Government Securities, at Carrying Value 226 22
Assets, Fair Value Disclosure 717 768
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 475 730
US Government Securities, at Carrying Value 16 16
US Government Securities, at Carrying Value 226 22
Assets, Fair Value Disclosure 717 768
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 0 0
US Government Securities, at Carrying Value 0 0
Assets, Fair Value Disclosure $ 0 $ 0